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Lunar regolith presents unique challenges for laser-based additive manufacturing. Unlike conventional metal or ceramic powders, regolith is a heterogeneous mixture of ceramics, metals, metal oxides, and minerals. During laser processing, each constituent undergoes independent phase transitions, creating material behavior variations between layers. Excessive heat causes dissociation and gas bubble formation, while rapid cooling traps porosity. The glassy components are particularly sensitive; once melted, they cannot return to their original state, and improper thermal management during re-melting causes crystalline structure failures and anisotropy throughout parts. This methodology addresses these challenges through coordinated thermal control across the build. Custom scan patterns and beam-shaping optics maintain target temperature ranges across the processing area while controlling heating and cooling rates. Layer height, hatch spacing, scan pattern, re-heating intervals, laser power, and inter-layer dwell times are precisely coordinated to manage the sequential phases of melting, nucleation, grain growth, and annealing. Previous layers of unsintered regolith act as insulation and as a controlled quench medium, maintaining temperature and preheating subsequent layers. A dedicated build plate is not required; a firebrick build plate has been used to support rapid, quick-turn parameter development in a laboratory setting. Real-time thermal imaging monitors the process. The methodology has been demonstrated in sustained operation within a thermal vacuum chamber at 10e-6 Torr, replicating the operational environments for lunar and Martian surface manufacturing. The amorphous vitrified glass process is at TRL 5; glass-ceramic components are currently undergoing validation for final strength claims. This advanced thermal management process is available for patent licensing.

The invention consists of a 3D print head apparatus that heats and extrudes a regolith-polymer (or other) mixture as part of an additive manufacturing process. The technology includes a securing mechanism, hopper, nozzle, barrel, and heating system. The securing mechanism attaches to a wrist joint of a robotic arm. The hopper, connected to the securing mechanism, has a cavity and a lower aperture. The barrel is an elongated, hollow member with its first end connected to the hopper's lower aperture and its second end connected to the nozzle's upper aperture. The heating system is positioned along the barrel and comprises a heater, thermocouple, insulator, and heating controller. The heating controller activates the heater based on input signals received from the thermocouple. The print head apparatus also includes a feed screw, drive shaft, and motor. The feed screw is positioned within the elongated hollow member of the barrel, and the drive shaft transmits torque to the feed screw. The motor provides torque to the drive shaft. An agitator is secured to the drive shaft, facilitating the consistent movement and mixing of the regolith-polymer mixture in the hopper. The nozzle includes a tube with an open end and an occluded end, allowing the mixture to be extruded through the lower aperture. The jointly developed 3D print head technology enables efficient, large-scale additive construction using in-situ resources, such as regolith or other materials. The innovation reduces the need for transporting materials from Earth and allows for sustainable habitat development on the Moon or Mars. Given its adaptability to different crushed rock-polymer materials, the invention may also serve as an alternative to conventional Portland concrete construction on Earth.